JPH09126372A - Tightening band - Google Patents

Abstract

(57) An object of the present invention is to provide a tightening band having a simplified structure, good productivity, and improved sealing property of a member to be tightened. SOLUTION: In a tightening band formed by overlapping both end sides of a band-shaped metal plate into a ring shape, a band-shaped band member 2 having one end formed in a bifurcated shape and a position at which both end sides of the band member 2 overlap each other. The band member 2 is formed by outwardly bending in a gate shape and is squeezed by being pinched by a tool.
And a locking projection 4 formed upright near the bifurcated end 2a of the band member 2.
And a hole 5 capable of locking the locking projection 4 formed at the other end side position where the forked end 2a of the band member 2 is overlapped.
And a locking projection 4 formed upright near the bifurcated end 2a of the band member 2 is locked in the hole 5 to form a ring shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tightening band for tightening and fixing a member to be tightened in a joint portion of a drive transmission system of an automobile and a connecting portion such as a radiator pipe in an engine room.

[0002]

2. Description of the Related Art Conventionally, a universal joint used in a drive transmission system of an automobile or the like is coated with grease as a lubricant for bearings and joints, and the joint portion is covered with a rubber or resin cover. It is tightened and sealed by a tightening band which is a metal band member. Further, the pipe connected to the radiator in the engine room is tightly sealed by tightening the hose connecting portion with the tightening band without water leakage.

The applicant of the present application has the tightening ears as the above-mentioned tightening band, and has the tightening shown in the application of Japanese Patent Application No. 1-301442 for the purpose of surely tightening without causing a phenomenon such as springback. Suggested a band. This tightening band is composed of two parts, a band member and a tightening member. The band member is formed by forming a long metal band-shaped band into a ring shape, and a locking claw is formed at one end thereof. Further, one end side of the tightening member is spot-welded to the band member with the tightening ear as the center, and a locking hole is drilled on the opposite side through the tightening ear.

To use the above-mentioned tightening band, the object to be fastened having the band inserted therein is connected to a pipe or the like, and then the tightening band is arranged at this connecting portion to reduce the diameter. Next, when the tightening ears are crushed, the ends of the band member approach each other and the diameter is reduced, and the locking claws are locked in the locking holes of the tightening member.
Even if an attempt is made to expand the diameter by the elastic force of the object to be fastened, the reduced diameter state is maintained. As a result, the springback of the tightening ear firmly tightens the tightening band without expanding its diameter.

[0005]

However, the tightening band shown in Japanese Patent Application No. 1-301442 mentioned above is composed of two parts, a band member and a tightening member, and has a large number of parts, so that the welding position easily varies. , Takes time to manufacture. Further, when tightening an object to be fastened, a step or a widthwise shift occurs on the inner peripheral surface due to the overlapping of the band member and the tightening member. This step or deviation is within the permissible range if the object to be fastened is a rubber material or the like, but in the case of a resin cover used for joint parts of automobiles in recent years, internal grease leaks out. There was a fear.

An object of the present invention is to provide a tightening band which has a simplified structure, is highly productive, and enhances the sealing property of a member to be tightened.

[0007]

The present invention has the following constitution in order to achieve the above object. That is, in a tightening band formed by overlapping both end sides of a band-shaped metal plate into a ring shape, a band-shaped band member having one end formed into a bifurcated shape and a gate member outwardly at a position where both end sides of the band member overlap. A tightening ear that is bent into a shape and can reduce the diameter of the band member by squeezing it with a tool, a locking member that is formed upright near the bifurcated end of the band member, and a bifurcation of the band member. A hole capable of locking the locking member formed at the other end side position where the end portions are overlapped,
And a locking member formed upright near the bifurcated end of the band member is locked in the hole to form a ring shape.

[0008] Further, by crushing the tightening tabs by squeezing the widthwise central portion with a tool, both widthwise sides of the band member are bent toward the outer peripheral surface side, and the forked end portion of the band member and an inner portion continuous with the forked end portion. It is characterized in that the peripheral surface and the peripheral surface are formed substantially flush with each other. Further, when the tightening ear is crushed by being pinched with a tool, the forked end of the band member moves in the direction of contracting and expanding the locking projection using the elongated hole as a guide to tighten the member to be tightened. Is characterized by.

[0009]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 is a perspective view of a tightening band, FIG. 2 is an explanatory view showing an assembled structure of the tightening band, FIG. 3 is an explanatory view showing a state in which a tightening ear is pinched by a tool and crushed, and FIG. 4 is an explanatory view of a tightening tool. is there.

First, the overall structure of the tightening band will be described with reference to FIG. I do. In FIG. 1, reference numeral 1 is a tightening band formed by overlapping both end sides of a band-shaped metal plate to form a ring shape. This tightening band 1
As shown in FIG. 2, a band-shaped band member 2 having one end formed in a bifurcated shape is used. The band member 2 has a width of about 6 mm, a thickness of 0.8 mm, and a length of 236 mm, and is relatively soft stainless steel containing iron (SUS43).
0) is preferably used.

Further, at the position where both ends of the band member 2 overlap, the tightening ears 3 are outwardly bent and formed in a gate shape. The tightening ears 3 are so-called Oetiker ears, and the band member 2 formed in a ring shape can be reduced in diameter by being pinched and crushed by a tightening tool described later. Further, a locking projection 4 as a locking member is formed upright near the bifurcated end 2a of the band member 2. This locking projection 4
Is formed into a ring shape by engaging with a long hole 5 drilled at the other end side position where the forked end portion 2a of the band member 2 is overlapped. Further, a fixed portion 6 in which the vicinity of the fixed side end portion 2b of the hand member 2 and the bifurcated end portion 2a side are fixed by resistance welding.
Are formed, and the ring shape is held more firmly. With respect to the welding position of the fixing portion 6, by locking the locking projection 4 in the elongated hole 5, it is easy to obtain positional accuracy and it is possible to suppress variations in the welding position depending on the product.

Next, the assembly structure of the tightening band 1 will be described with reference to FIG. The band-shaped band member 2 is formed with a locking projection 4, an elongated hole 5, a tightening ear 3, and a fixing portion 6 in this order from the bifurcated end 2a toward the fixing side end 2b.

The bifurcated end portion 2a is formed by forming one end of the band member 2 into a bifurcated shape so that the tip portion is narrowed,
When the tightening ears 3 are swaged, the both sides in the width direction can be easily warped to the outer peripheral surface side. The locking projection 4 is formed by making a cut in the band member 2 to stand up and bending it into an L shape. The long hole 5 is a band member 2
When the is shaped like a ring, the bifurcated ends 2a are formed at the overlapping positions. Further, the locking projection 4 moves in the direction of expanding the diameter due to the rigidity of the band member 2 and moves into the slot 5.
It is locked at the end of. Further, in this state, the distance from the locking protrusion 4 to the fixed side end portion 2b is always constant, which is advantageous in that the welding position can be easily positioned. Further, the tightening tab 3 is formed by dimple-processing the flat plate-shaped band member 2 to form the recessed portion 3a, and then bending it into a gate shape. The recess 3a acts so as to absorb elastic stress so that the upper surface does not rise upward when caulking, and prevents the tightening band 1 from expanding in diameter due to springback. In addition, the fixed side end 2
In order to effectively perform resistance welding in the vicinity of b, a recess 6a that abuts the hand member 2 on the forked side end 2a side is formed, and the lower surface of the forked side end 2a of the band member 2 and the fixed side end. By connecting the upper surface of the portion 2b to a welding device and passing a welding current, the concave portion 6a is heated and melted to form the planar fixing portion 6.

To assemble the above-mentioned tightening band 1,
The band-shaped band member 2 is formed in a ring shape to form a forked end 2
Assembly is performed by locking the locking projections 4 in the elongated holes 5 on the a side and forming the fixed portions 6 by resistance welding on the fixed side end portions 2b. According to the above configuration, since the tightening band 1 is composed of one part, the number of parts is small, and troublesome processing is not required, so that the tightening band 1 with low cost, good productivity, and high accuracy can be provided. .
When the band member 2 is formed into a ring shape, both sides in the width direction are slightly warped toward the outer peripheral surface side, so that the thickness of the bifurcated end portion 2a is easily absorbed.

Further, in order to tighten the above-mentioned tightening band 1 on a member to be tightened such as a resin material, as shown in FIG. 3, the ring-shaped tightening band 1 is inserted into the member to be tightened and the tightening shown in FIG. Tightening ear 3 with tool 7
Is crushed and the tightening band 1 is reduced in diameter as a whole and tightened. The tightening tool 7 has a configuration similar to that of a known plier, and as shown in FIG. 4, protrusions 7c and 7d are provided at the center in the width direction at the tips of the arms 7a and 7b that rotatably intersect.
Are formed.

When the tightening ears 3 are clamped and crushed by the tightening tool 7, the band members 2 are crushed by squeezing the widthwise central portions by the projections 7c and 7d as shown in the section AA of FIG. Since both widthwise sides of the band are effectively bent toward the outer peripheral surface side, and the narrow bifurcated end 2a is disposed in the portion where the warpage occurs, the bifurcated end 2a of the band member 2
The inner peripheral surface and the inner peripheral surface continuous therewith can be formed substantially flush with each other, and the step can be eliminated to further enhance the sealing performance. After tightening, the ring state is reinforced by the tightening ears 3 and the fixing portion 6 that are dimple processed,
Due to the elasticity of the member to be tightened, the diameter expansion of the tightening band 1 can be minimized. The warp on both sides in the width direction of the band member 2 is caused only by molding the band member 2 into a ring shape.
By crimping the central portion of the tightening ear 3 in the width direction,
It can be further manifested.

When the tightening ear 3 is crushed by the tightening tool 7, the forked end 2a of the band member 2 moves the locking projection 4 along the elongated hole 5 in the direction of reducing the diameter (direction of arrow a). , Direction to expand again due to rigidity (direction of arrow b)
Then, the locking projection 4 is locked in the elongated hole 5 to tighten the member to be tightened. At this time, the locking projection 4 is attached to the long hole 5
By moving as a guide, it is possible to prevent the overlapping portions inside and outside the band member 2 from being displaced in the width direction due to tightening.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.

[0019]

As described above, according to the present invention, since the tightening band is composed of one part, the number of parts is small,
Since no complicated processing is required, it is possible to provide a high-precision tightening band at low cost with good productivity.

When the tightening ears are squeezed by the tightening tool to squeeze, the center portion in the width direction is squeezed to squeeze and thereby the warp of the band member toward the outer peripheral surface on both sides in the width direction becomes apparent. Since the narrow bifurcated end portion is arranged in the warped portion, the bifurcated side end portion and the ring inner peripheral surface continuous with the bifurcated end portion can be formed substantially flush with each other, eliminating the step. The tightness of the member to be tightened can be further enhanced.

Further, when the tightening ears are crushed by the tightening tool, the locking projections are moved along the elongated holes, so that the overlapping portions inside and outside the band member due to tightening can be prevented from shifting in the width direction.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tightening band.

FIG. 2 is an explanatory view showing an assembly structure of a tightening band.

FIG. 3 is an explanatory view showing a state in which a tightening ear is squeezed by being pinched by a tool.

FIG. 4 is an explanatory diagram of a tightening tool.

[Explanation of symbols]

 1 Tightening band 2 Band member 2a Bifurcated end 2b Adhering side end 3 Tightening ear 4 Locking protrusion 5 Long hole 6 Adhering part 7 Tightening tool

Claims (3)

[Claims] 1. A tightening band formed by overlapping both end sides of a band-shaped metal plate to form a ring shape, and a band-shaped band member whose one end is formed into a bifurcated shape, and an outer side at a position where both end sides of the band member overlap each other. A locking ear that is bent in a gate shape in one direction and that can reduce the diameter of the band member by pinching and crushing it with a tool; a locking member that is formed upright near the forked end of the band member; A hole capable of locking the locking member pierced at the other end side where the forked ends of the member are overlapped with each other, and the locking member formed upright near the forked end of the band member is used as a hole. A tightening band characterized by being locked and formed in a ring shape. 2. A widthwise center of the band member is crushed by a tool to squeeze the tightening tabs in the widthwise direction, so that both widthwise sides of the band member are warped toward the outer peripheral surface side, and a forked end of the band member and an inner end continuous with the forked end. The tightening band according to claim 1, wherein the fastening band is formed to be substantially flush with the peripheral surface. 3. When the tightening tab is crushed by being pinched by a tool, the forked end of the band member is moved in a direction in which the locking projection is reduced in diameter and expanded by using the elongated hole as a guide, so that the member to be tightened is tightened. The tightening band according to claim 2, wherein the tightening band is tightened.